Umbrella stand



FIG. 1 is a perspective view of an umbrella stand showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a left side elevational view, the opposite side being a mirror image thereof. 

The ornamental design for an umbrella stand, as shown and described. 